沼泽地土壤圆锥指数和剪切强度的试验研究  

STUDY ON THE CONE INDICES AND SHEAR STRENGTHS OF MUSKEG SOILS

作　　者：刘大维[1,2,1] 陈吉清[1,2,1] 陈秉聪[1,2,1] 

机构地区：[1]青岛大学车辆与交通工程研究中心 [2]吉林工业大学农机学院

出　　处：《农业机械学报》1999年第1期5-8,共4页Transactions of the Chinese Society for Agricultural Machinery

基　　金：国家自然科学基金

摘　　要：采用ＳＹ１水田静载承压仪和ＤＴＣ３６土壤动态三轴测试仪测取了大庆沼泽地区两种典型土壤的圆锥指数和剪切强度，建立了圆锥指数与贯入深度关系的数学模型，分析了含水量对剪切强度的影响及该地区车辆通过性差的原因，为研制开发适于该地区行驶的新型车辆提供了依据。The cone indices and the shear strengths of two kinds of typical muskeg soil in Daqing marsh land were measured by SY1 of paddy field penetrometer and DTC36 dynamic triaxial soil testing machine, the relationship between cone index and penetrating depth was developed mathematically, the influence of moisture content on shear strength was analyzed and the cause of poor trafficability for conventional vehicles was explained. The load bearing character of the muskeg soil in Daqing marsh land is hard on surface layer and soft on the inside within the measuring range. The soil bearing capacity is weak. The biggest cone indices CI max emerges in the range of penetrating depth z from 10 cm to 15 cm. When water content w is nearly 35%, CI max will amount to 300 kPa or so where conventional vehicles are difficult, even can't go through or work. The relationship between cone indices CI and penetrating depth z can be expressed by a segmented twice power curve. The water content of the muskeg soil in Daqing marsh land has a significant influence on the shear strength. The shear strength decreases by twice power curve in compliance with the increment of water content. The inner friction angle and cohesion of the powdery sticky soil with water content from 25% to 38% range from 0 45° to 1 9° and from 1 353 kPa to 15 2 kPa respectively; those with water content from 23% to 35% range from 0 5° to 3° and from 0 854 kPa to 2 9 kPa respectively.

关 键 词：圆锥指数 剪切强度 土壤 沼泽地 

分 类 号：S152.9[农业科学—土壤学]